[s-cars] Viscous Fan Bearing Replacement

[mike schowengerdt]

ok , here is how to figure this out on almost any car i have 
encountered......look at the fan blade and see what direction it turns to do 
it's job of pulling air through the radiator....that's the way you turn the fan 
to loosen (on vw-audi cars the nut is usually part of the fan blade assembly, so 
you turn the nut that direction...if the nut were part of the hub then it would 
be the other way )....the reasoning/reality is that the thread orientation is 
such that normal driving force from the belt/engine will make the coupling 
tighter against the resistance of the fan blade doing the work)

the tricky/confusing thing as i recall on some of our urS cars is that the drive 
hub is reverse drivin by the back side of the belt and actually turns the 
opposite of the engine, but if you only look at ther fan blade itself it is 
still easy to figure the 
disconnect..................HTH............................m




________________________________
From: "racingiron at comcast.net" <racingiron at comcast.net>
To: s-car-list at audifans.com
Sent: Wed, January 16, 2013 9:13:28 PM
Subject: [s-cars] Viscous Fan Bearing Replacement

I've got a growl from the engine bay that's getting progressively worse.  I've 
pinpointed the source as the viscous fan bearing.  I was hoping to replace it 
tonight, and everything went fine until I tried to get the clutch off.  I've got 
a 32mm bicycle headset wrench and I made a pin wrench to secure the pulley.  I 
applied massive force in both directions with no hint of movement, except from 
the entire engine.  I destroyed my pin wrench, so I'll go rent a real one from 
the FLAPS.  I'll probably also buy a longer 32mm fan wrench to get more 
leverage.  The '93 popped right off with little drama.

My question: What's the most likely thread direction on a '92?  My '93 was 
normal righthand.  Bentley says flatly that they're lefthand (obviously 
sometimes untrue).  I've seen reports of each in the archives.  The pulley (and 
probably the flange it rides on) and the clutch are slightly different between 
my '92 and '93, so I'm wondering if I should expect reverse threads.  Any tips 
for breaking a stubborn clutch free?

Eric R.
'86 urq
'92 urS
'93 urS
_______________________________________________
S-CAR-List mailing list
http://audifans.com/mailman/listinfo/s-car-list
http://www.audifans.com/kb/List_information